We use this tool to create RSS Feeds. The tool works and is free. The company does ask for a donation.

Their information:

Please fill out the following form. Most important is the address of your news feed, which should be in valid RSS format.

Some RSS files to play around:
(copy and paste the lines into the RSS URL field)
http://rss.news.yahoo.com/rss/topstories
http://www.alistapart.com/rss.xml
http://www.wired.com/news_drop/netcenter/netcenter.rdf
http://rss.news.yahoo.com/rss/internet

Hit [ Create HTML ] afterwards and you will get the HTML code which integrates the feed into your website using the IFRAME tag. Below the code there is also a preview.

http://www.rss-info.com/en_rssinclude-simple.html